Pixel driving circuit, driving method thereof, and display panel

Abstract

The present invention teaches a pixel driving circuit including a base pixel circuit, a touch control circuit, and a switch. The base pixel circuit has a first terminal connected to a DC high voltage signal, and a second terminal connected to a positive terminal of an electronic lighting element. The electronic lighting element has a negative terminal connected to a DC low voltage signal. The base pixel circuit drives or turns off the illumination of the electronic lighting element. The touch control circuit is connected to a junction between the negative terminal of the electronic lighting element and the DC low voltage signal through the switch. Based on whether the base pixel circuit drives the electronic lighting element to illuminate, the touch control circuit turns on or off the switch accordingly. The present invention therefore resolves the existing touch display panel's thickness and inflexible issues.

What is claimed is: 
     
         1 . A pixel driving circuit, comprising a base pixel circuit, a touch control circuit, and a switch, wherein
 the base pixel circuit has a first terminal connected to a DC high voltage signal, and a second terminal connected to a positive terminal of an electronic lighting element; the electronic lighting element has a negative terminal connected to a DC low voltage signal; the base pixel circuit drives or turns off the illumination of the electronic lighting element;   the touch control circuit is connected to a junction between the negative terminal of the electronic lighting element and the DC low voltage signal through the switch; and, based on whether the base pixel circuit drives the electronic lighting element to illuminate, the touch control circuit turns on or off the switch accordingly.   
     
     
         2 . The pixel driving circuit according to  claim 1 , wherein, if the base pixel circuit drives the electronic lighting element to illuminate, the switch is opened and the touch control circuit is prevented from functioning as the touch control circuit is disconnected from the DC low voltage signal; and
 if the base pixel circuit prevents the electronic lighting element from illuminating, the switch is closed and the touch control circuit functions as the touch control circuit is connected to the DC low voltage signal.   
     
     
         3 . The pixel driving circuit according to  claim 2 , wherein the touch control circuit comprises an inductive capacitor, a coupling capacitor, an operational capacitor, and an operational amplifier;
 the inductive capacitor has a terminal connected to a touch sensitive line, and another terminal connected to a terminal of the switch, a terminal of the coupling capacitor, a terminal of the operational capacitor, and a first input terminal of the operational amplifier;   another terminal of the coupling capacitor is connected to ground;   the operational capacitor has another terminal connected to an output terminal of the operational amplifier, thereby forming a negative feedback amplification circuit with the operational amplifier; and   a second input terminal of the operational amplifier is connected to an internal working voltage signal.   
     
     
         4 . The pixel driving circuit according to  claim 3 , wherein the base pixel circuit comprises a switch transistor, a driving transistor, a control transistor, and a storage capacitor;
 the switch transistor has the gate connected to a scan signal, the drain connected to a data signal, and the source connected to a terminal of the storage capacitor and the gate of the driving transistor;   the driving transistor has the drain connected to the DC high voltage signal, and the source connected to the drain of the control transistor;   the control transistor has the gate connected to a control signal, and the source connected to the positive terminal of the electronic lighting element; and   another terminal of the storage capacitor is connected to the DC high voltage signal.   
     
     
         5 . The pixel driving circuit according to  claim 4 , wherein the electronic lighting element is an organic light emitting diode (OLED). 
     
     
         6 . A driving method for a pixel driving circuit, the pixel driving circuit comprising a base pixel circuit, a touch control circuit, and a switch, where the base pixel circuit has a first terminal connected to a DC high voltage signal and a second terminal connected to a positive terminal of an electronic lighting element, the electronic lighting element has a negative terminal connected to a DC low voltage signal, the touch control circuit is connected to a junction between the negative terminal of the electronic lighting element and the DC low voltage signal through the switch, the driving method comprising the steps of
 determining a current operation state of the base pixel circuit, where the current operation state of the base pixel circuit is either driving the electronic lighting element to illuminate or preventing the electronic lighting element from illuminating; and   controlling whether the touch control circuit to function or not by closing or opening the switch in accordance with the current operation state of the base pixel circuit.   
     
     
         7 . The driving method according to  claim 6 , wherein the step of controlling whether the touch control circuit to function or not comprises the step of
 if the base pixel circuit drives the electronic lighting element to illuminate, the switch is opened and the touch control circuit is prevented from functioning as the touch control circuit is disconnected from the DC low voltage signal.   
     
     
         8 . The driving method according to  claim 6 , wherein the step of controlling whether the touch control circuit to function or not comprises the step of
 if the base pixel circuit prevents the electronic lighting element from illuminating, the switch is closed and the touch control circuit functions as the touch control circuit is connected to the DC low voltage signal.   
     
     
         9 . The driving method according to  claim 6 , wherein the touch control circuit comprises an inductive capacitor, a coupling capacitor, an operational capacitor, and an operational amplifier;
 the inductive capacitor has a terminal connected to a touch sensitive line, and another terminal connected to a terminal of the switch, a terminal of the coupling capacitor, a terminal of the operational capacitor, and a first input terminal of the operational amplifier;   another terminal of the coupling capacitor is connected to ground;   the operational capacitor has another terminal connected to an output terminal of the operational amplifier, thereby forming a negative feedback amplification circuit with the operational amplifier; and   a second input terminal of the operational amplifier is connected to an internal working voltage signal.   
     
     
         10 . The driving method according to  claim 6 , wherein the base pixel circuit comprises a switch transistor, a driving transistor, a control transistor, and a storage capacitor;
 the switch transistor has the gate connected to a scan signal, the drain connected to a data signal, and the source connected to a terminal of the storage capacitor and the gate of the driving transistor;   the driving transistor has the drain connected to the DC high voltage signal, and the source connected to the drain of the control transistor;   the control transistor has the gate connected to a control signal, and the source connected to the positive terminal of the electronic lighting element; and   another terminal of the storage capacitor is connected to the DC high voltage signal.   
     
     
         11 . The driving method according to  claim 6 , wherein the electronic lighting element is an organic light emitting diode (OLED). 
     
     
         12 . A display panel comprising a pixel driving circuit, wherein the pixel driving circuit comprises a base pixel circuit, a touch control circuit, and a switch;
 the base pixel circuit has a first terminal connected to a DC high voltage signal, and a second terminal connected to a positive terminal of an electronic lighting element; the electronic lighting element has a negative terminal connected to a DC low voltage signal; the base pixel circuit drives or turns off the illumination of the electronic lighting element;   the touch control circuit is connected to a junction between the negative terminal of the electronic lighting element and the DC low voltage signal through the switch; and, based on whether the base pixel circuit drives the electronic lighting element to illuminate, the touch control circuit turn on or off the switch accordingly.   
     
     
         13 . The display panel according to  claim 12 , wherein, if the base pixel circuit drives the electronic lighting element to illuminate, the switch is opened and the touch control circuit is prevented from functioning as the touch control circuit is disconnected from the DC low voltage signal; and
 if the base pixel circuit prevents the electronic lighting element from illuminating, the switch is closed and the touch control circuit functions as the touch control circuit is connected to the DC low voltage signal.   
     
     
         14 . The display panel according to  claim 13 , wherein the touch control circuit comprises an inductive capacitor, a coupling capacitor, an operational capacitor, and an operational amplifier;
 the inductive capacitor has a terminal connected to a touch sensitive line, and another terminal connected to a terminal of the switch, a terminal of the coupling capacitor, a terminal of the operational capacitor, and a first input terminal of the operational amplifier;   another terminal of the coupling capacitor is connected to ground;   the operational capacitor has another terminal connected to an output terminal of the operational amplifier, thereby forming a negative feedback amplification circuit with the operational amplifier; and   a second input terminal of the operational amplifier is connected to an internal working voltage signal.   
     
     
         15 . The display panel according to  claim 14 , wherein the base pixel circuit comprises a switch transistor, a driving transistor, a control transistor, and a storage capacitor;
 the switch transistor has the gate connected to a scan signal, the drain connected to a data signal, and the source connected to a terminal of the storage capacitor and the gate of the driving transistor;   the driving transistor has the drain connected to the DC high voltage signal, and the source connected to the drain of the control transistor;   the control transistor has the gate connected to a control signal, and the source connected to the positive terminal of the electronic lighting element; and   another terminal of the storage capacitor is connected to the DC high voltage signal.   
     
     
         16 . The display panel according to  claim 15 , wherein the electronic lighting element is an organic light emitting diode (OLED).